Concentrating table



Sept. 20, 1927. 1,642,843

- w. F. DEISTER ET AL CONCENTRATI NG TABLE Filed Sept. 22, 1924 v .2 Sheets-Sheet 1 INVENTOR. w File-i312 L imjc1blr BY PM 7-LZ A TTORNE Y.

, 1,642,843 W. F. DEISTER ET AL CCNCENTRATING TABLE Sept. 20, 1927.

Filed Sept- 22, 1924 Z ShetS-Sheet 2 INVENTOR. Z41 fig Zkm (er *HL f Ml.. Jeioi'ar ATTORNEY.

Patented Sept. 29, 1927.

arren srATE s PATENT w'i nIAM r. nnrsrrnn Ann EMIL nnIsr-nncn ro a'r warns, inn iann, assrencns no nnIsrE-n Marianna company, or near nnIANA.

W Y we e a c e a r r or CONCENTRATING TAB-LE.

Application filed September 22,1924. Serial No. 738,966.

The invention relates to concentrating tables of the transversely inclined, diiierentia lly reciprocated type. V

In the concentration of various ores on concentrating tables the practice formerly was to size or classify the materials into roughing feeds, sand table feeds and slimes and then treat the classified 'feeds separately on tables designed therefor. Later, instead of classifying the materials, the entire mixture of table'feeds was first treated on a roughing table, and then the roughed concentrates were cleanedon a. finishing or cleaning table. The tailing s were then reground and treated on Sand tables or in flotation devices or treated on a combination of such tables and devices. This later practice has continued generally up to the present time. In carrying on the foregoing operations not only are numerous tables required to do the work but a large amount of floor space is thereby taken up or occupied by'the machines, and the costof operation is relatively high.

The object of our present invention is to provide a table upon which the roughing process and the concentration of mixed materials are carried ,on simultaneously and thereby accomplish a great saving in the number of machines, in the necessary floor space and cost of operation. Other objects and advantages of the invention will be set forth hereinafter.

The invention consists in a table having upon itsconcentrating surface a main stratifying orroughing section, a secondary concentrating section and a final cleaning section, the secondary and final cleaning sections being progressively higher than the main section, and a resistance plane being disposed along the .rear edge of each section.

An embodiment of the invention is illustrated in the accompanying drawings, in whi h Figure 1 is a plan view of the deck of a table embodying the invention; Fig. 2 a cross-sectional view on line 2-2 of Fig. 1 Fig. 3 a cross-sectional view on line 3- 3 of Fig 1; Fig. 4 a. cross-sectional view on line 4:'& of Fig. 1; Fig. 5 a cross-sectional view on line 5-5 of Fig. 1 Fig. 6 a cross-sectional view on line 6-45 of Fig. 1; Fig. 7 a plan view of the deck with the riffles, the covering, the feed box and the dressing Water face of said deck; Fig. 8 an enlarged crosssectional view on line 88 of Fig. 1-; Fig. 9 an enlarged cross-sectional view online 9. .9 of Fig. l and F ig. '10 an enlarged cross-sed tional View von line 1,0 10 of Fig. 1 I

The deck 1 of the table is suitably support- ;ed for diiterentiail reciprocation longi{tudinally by suitable mechanism, the motion mechanism being connected to the deck at its head end 2 and the direction of reciprocation being indicated by the arrow at said end of the deck. A high board 3 extends along the head end of the deck and a high board 4 ex.- tends along the feed and dressing waterside oof the deck. Aiieed boX 6 is suitably supported above the deck .at the side 5 adjacent the head end of the table anda dressing water launder 7 is also supported above {the deck and extending from the-feed box to ward the concentrates discharge end of the deck. The materials mixed with Wateriare fed into the feed :boX ,6 from which ,theydescend onto the deck. i

v The deck in operatin position slopes transversely downwardly irom the feed and dressing Water side 5 toward the tailings discharge side8, and in a longitudinal direction the deck is preferably :level, its concentrating surface beng composed of a series of sections which differ in their height as about to be described.

A main stratifying plane or section 9 is formed at the head end of the deck and exterminates a't'its forward or upper edge with a plateau 12 that is substantially parallel with the main plane 9. The co-terminal line b,?) between the resistance plane and the plateau 12 is substantially parallel .to the "coterminal line a-a. Forwardly of the plateau 12 and co-terminating with it on the line 0-0 that is snbstantially' parallel to the line b?) is a'second resistance plane 13 which also slopes upwardly toward the concentrates discharge end 10. a

The upper edge cZ--cl of the second resistance plane 18 is substantially parallel to the coterminal line cc, and said edge is coterminous with a second plateau 14. The forward edge, e-e of the plateau 14 is less oblique to the line of reciprocation than the rear edge thereof at cZd. Hence the top surface of the plateau is substantially triangular in shape and has a much greater area than the plateau 12. Forwardly of the plateau 14 and coterininating with it on the line ee is a third resistance plane 15 which slopes upwardly toward a third plateau 16 that extends along the concentrates discharge end 10. The plateau 16, in the present illustrative embodiment of the invention is also triangular in shape and is much larger than the plateau 14.

From the foregoing description it is apparent that fromthe head end of the deck toward the concentrates discharge end 10 the surface of the deck is formed with a main stratifying plane 9 and three plateaus with resistance planes connecting them so that the plateaus progressively increase in height toward the concentrates discharge end 10 of the deck.

The surface of the deck, as above described, is covered with linoleum 17 or other suitable covering and secured to the deck over the covering is a series of rifles extending from the head end toward the concentrates discharge end 10 of the deck. The form of the rifles is peculiar in the present embodiment of the invention. On the main stratifying plane 9 the rifles 18 are substanthe main rifles 18, their forward ends terminating at the crest of the first resistance plane 11, the forward ends of the cap rifles being also tapered longitudinally for a selected distance rearwardly of their tips. The cap rifles are valuable when mixed feeds are treated on the table and they may be omitted if a classified feed is treated on the table. On some ores it is efficacious to so secure the cap rifles to the main rifles that they overhang the upper sides of those rifles, as shown in Fig. 8. The overhanging cap rifles tend to hold the minerals in the and shallow (Fig. 10) and also taper longitudinally at their forward ends. There are substantially twice as many of the rlfles 20 as there are main rifles 18.

The extension rifles 21 on the uppermost plateau 16 are the lowest rifles on the deck. They extend toward the concentrates discharge end 10 of the deck at any selected angle with respect to the line of reciprocation of the table. In the present adaptation of the invention the extension rifles 21 extend upwardly on the transversely inclined plateau 16. l/Vhere very lean ores are treated on the table the extension rifles may be omitted.

lVhen the table is properly adjusted as to inclination and it is in operation, the materials with water descend on to the deck at its upper side and underneath the feed box and tend to flow down the transverse slope of the main section 9. The rifles retard the flow of the materials on said slope, which together with the reciprocating i'novenient of the table, cause the materials to stratify on the surface 9 in accordance.

with their specific gravities. The lightgangue flows over the tops of the rifles to the tailings discharge side and the reciprocating movement of the, deck advances the caught materials toward the concentrates discharge end 10 of the deck. lVhen the caught materials reach the'first or lower resistance plane the coarse light gangue, being in the upper stratum, is held back and some of it passes over the rifles on said plane toward the tailings discharge side since the rifles thereon taper longitudinally.

The minerals and gangue remaining with them pass onto the lower plateau where further elimination of light gangue takes place. The feed then passes up theintermediate re sistance plane where the gangue in the upper stratum is held back and washed over the longitudinally taperedrifles thereon to the tailings discharge side. The materials retained by the rifles'on the intermediate resistance plane pass onto the intermediate plateau. The coarse light gangue is practically removed by the time the materials reach the intermediate plateau. Such gangue as is with the minerals is relatively fine. This plateau, being substantially triangular in shape, has substantially a sheering action on the fine gangue and since the rifles are more numerous and lower than the main rifles and also taper longitudinallythe values are held on the plateau while the ion lighter gangue is sheered off by the wash water, the final resistance plane holding back the ganguesimilarly to the preceding resistance planes. Hence a secondary concentration of the feed is effected on the intermediate plateau. Such line gangue as reaches the final plateau is largely washed out by the wash water and the Concentrates, passing off the plateau at the concentrates discharge end, are very largely free from gangue.

It is thus seen that the feed is :tratified on the main stratifying section 9, the coarser gangue being removed on the lower rcsi 'tance plane, the lower plateau and the intermediate resistance plane. Hence the roughing process is carried on up to the intermediate plateau. Since the area of the intermediate plateau is relatively large and gangue that reaches it is relatively fine a secondary Stratification of the materials that reach this plateau takes place, the values be ing finally cleaned on the third plateau. {Hence the table is in effect both a roughing and a finishing table. I

When the table is properly ad-juited as to inclination and flow of dresing water, it

will operate efliciently without further adjustment irrespective of the feedwhether the feed varies in quantity or quality, and the line of separation between the gangue and the mineral remains constantly at its proper place on the deck. Hence the table, after it has been properly adjusted, automatically controls the line of separation between the gangue and the values through all "r *iations in the feed.

Since the table of our invention is both a roughing and a finishing device it eliminates roughing tables and sand or finishing tables and hence effects a large saving in labor, time, money and floor space.

I'Vhat we claim is:

1. In a concentrating table, a deck having upon its concentrating surface a roughing section and a finishing section, transversely tapered riifles on the roughing section and tapering longitudinally in their forward portions, cap rifiles secured to the tops of the transverselytapered riffles adjacent the high sides thereof, shallow rifiles on the finishing section adjacent the concentrates discharge end of the deck and shallow riflies on the latter section between the forward ends of the transversely tapered riffles and the rear ends of the first named shallow rifflei and being greater in number than the said transversely tapered riffies.

2. In a concentrating table, a deck having upon its concentrating surface a roughing section and a finishing section, relatively high transversely tapered rifiles on the roughing section, cap rifiles secured to the said high riffies and overhanging the high sides thereof, relatively shallow and narrow ri-flles on the finishing section and being greater in number than the high riflles and shallow riflles on the finishing section forwardly of the forward ends of the relatively shallow and narrow rifi'les and disposed at an angle to the latter riffles.

'3'. In a concentrating table, av transversely.

roughing section having their forward lends longitudinally tapered, cap riilies secured to the tops of the said high ri-files adjacent the high sides thereof respectively, riffles ion the adjacent portion of the finishing section that are parallel to the relatively high rifiles andbeing lower in height and narrower and' greater in number than said high riffles and rifiles on the second portion of the finishing section that are lower than those an the other portion of said section and extend upwardly on the transverse slope of said second portion of said section. r

i. In a differentially reciprocating, tran versely inclined concentrating table, a deck Y having upon its concentrating surface a roughing portion consisting of a main stratifying section, a diagonally disposed plateau forwardly of the main-section, a resistance plane between the main sectionand said plateau, an upwardly inclined resistance plane at the forward vside of the plateau, the said concentrating surface also having thereon a finishing portion consisting of a. secondary concentrating plateau, an upwardly inclined resistance plane adjoining the forward side of the secondary plateau and a final cleaning plateau between the latter resistance plane and the concentrates discharge end of the deck.

5. In a differentially reciprocating, transversely inclined concentratingtable, a deck having upon its concentrating surface a roughing portion consisting of a main stratifying section, a diagonally disposed plateau forwardly of the main section, a resistance plane between the main section and said plateau and an upwardly inclined resistance plane adjoining the forward side of the said plateau, the said concentrating surface also having thereon a finishing portion consisting of a secondary concentrating plateau and a final cleaning plateau, a resistance plane between the two latter plateaus, main riffles on the roughing portion extending in a direction substantially parallel to the line of reciprocation of the table, said rifiies being tapered transversely and their forward ends being tapered longitudinally and rela tively shallow riflies 0n the secondary concentrating plateau that are greater in numher than the main riffies.

6. In a differentially reciprocating, transversely inclined concentrating table, a deck having upon its concentrating surface a main stratifying section, an intermediate secondary concentrating section and a final cleaning section, the intermediate section being higher in elevation than the main stratifying section and the finalcleaning section being higher in elevation than the secondary concentrating section and disposed along the concentrates discharge end of the deck, re sistance planes between the sections, and riflles on the sections and resistance planes, the riflies on the intermediate section being lower and greater in number than those on y the main section.

7. In a differentially reciprocating, transversely inclined concentrating table, a deck having upon its concentrating surface a main stratifying section, an intermediate secondary concentrating section and a final cleaning section, the intermediate section being higher than the main section and the final cleaning section being higher than the intermediate section, an inclined. resistance plane along the rear side of each of the elevated sections, and riflies on the said sections and said resistanc-e'planes, the tops of the riffles on the main section being transversely inclined downwardly toward the tailings discharge side of the deck and the riifles on the intermediate section being greater in number and less in height than the rilfles on the main section.

8. In a differentially reciprocating, transversely inclined concentrating table, a deck having upon its concentrating surface a main stratifying section extending from the head end of the deck toward the concentrates discharge end thereof, a series of three plateaus on said surface between the for ward side of the main section and the concentrates discharge end of the deck, each plateau being higher than the main section and higher than the plateau rearwardly of it, a resistance plane between the main section and the first or lowest plateau and disposed at an oblique angle to the direction of reciprocation of the deck, a second resistance plane between the first and intermediate plateaus and disposed similarly to the first named resistance plane, a third resistance plane between the intermediate and third plateaus and disposed at an oblique angle to the direction of reciprocation but less oblique than the preceding resistance planes whereby to ,form' the intermediate plateau with a larger area than the first plateau, main rifiles substantially parallel to the line of reciprocation of the table and extending on the main stratifying section and across the first plateau and adjoining,

resistance planes to the rear side of the intermediate plateau, riffies on the intermediate plateau that are lower and narrower and greater in number than the main riifles.

In witness whereof we have hereunto subscribed our names this 13th day of Septenr her, 1924..

WILLIAM F. DEISTER, EMIL DEISTER. 

